Solved Computer Question. Desperately need your help.

Hey Experts, please help me with your valuable suggestion and advise. I bought the system around 3 months back. I asked the shopkeeper to get me a descent gaming PC around the range of 35k Indian Rupees. He suggested the items - I bought it - but I cannot play any game smoothly (it lags so hard). Am I missing some parts ? Do I need to buy an additional graphic card ? The shop keeper told me that the processor and the graphic card is one (2 in 1). I am not at all good with Computers and stuff, so can you please help out with this? See some details below:-

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